Orange

Takamiya Naho received a letter ten years from the future. At first she thought it was a prank until, everything that was written on it actually happened. The letter is sent to her to do something that her future self should have done before and  everything she regretted in the past. On the other hand Kakeru, one of her friends and she fell in love with died ( said in the letter ). Will she be able to save him or just ignore the letter from her future self?